993 engine tray

[plroussel]

Anyone have any Opinions on running with or with out it? I have a 1996 C4S. Thanks

[Raleigh993]

Since you asked...

After reading many threads here and there, I have removed mine for the following reasons:

-Local wrench agreed.
-Will not collect dripping oil and disguise potential problems.
-Will not trap heat and theoretically keep engine temps lower.
-Will not dampen sound. Supposedly one of the reasons it was added was to comply with Swiss noise limits. I happen to like the noise.
-Lowers weight.

That's all I got.

[yel911]

Raleigh993 nailed it.....

[plroussel]

Yup, I'm taking mine off. Thanks for the info! Cheers. Pat

[vintage guy]

I have mine removed as well but if your car is lowered, make sure the heat exchanger air outlets are corectly positioned high so they don't catch on something while you're driving.

As mentioned, don't be surprised if you discover oil leaks.

[plroussel]

Oil leaks in a 911!? nah, never heard of such things. My 71 leaks, my 87 leaked, and my 88, doesnt leak...yet!

[Traveller]

Mine is only "off" because that is how my car came. The tray is stored at the moment.

Once I determine if it really makes a difference or not by taking actual measurements, I'll know for sure whether to leave it off or not.

The Porsche forums, like any forum has its share of unsubstantiated information.

[Bill Verburg]

Here's what the factory says, believe it or not
from Document P10-L "After Sales Training Types 964 & 993" pg 24

[Traveller]

Originally Posted by Bill Verburg

Here's what the factory says, believe it or not
from Document P10-L "After Sales Training Types 964 & 993" pg 24

I've read that, Bill.

I also have the PDF patent by the designer and Porsche.

[cgfen]

Originally Posted by Traveller

Mine is only "off" because that is how my car came. The tray is stored at the moment.

Once I determine if it really makes a difference or not by taking actual measurements, I'll know for sure whether to leave it off or not.

The Porsche forums, like any forum has its share of unsubstantiated information.

alex, you discussed instrumenting thermal points of interest with T/Cs nearly two years ago in hopes of disabusing us of "unsubstantiated infromation".
have you not found time to perform this experiment?
looking forward to hearing the results and see how well they correlate with the similar testing done by TJ90 on RL 3 1/2 years ago...

Craig

[Traveller]

Originally Posted by cgfen

alex, you discussed instrumenting thermal points of interest with T/Cs nearly two years ago in hopes of disabusing us of "unsubstantiated infromation".
have you not found time to perform this experiment?
looking forward to hearing the results and see how well they correlate with the similar testing done by TJ90 on RL 3 1/2 years ago...

Craig

I wanted to last summer, but when I crawled under the car, I was unable to find those M10 threaded holes I remember seeing when I did my valve covers and spark plugs the first winter I had my 993. I guess with the exhaust and tin removed they were visible...don't know...can't remember.

Plan B is to thread studs where a thermocouple has been bonded within a hole in the stud into the unused exhaust stud holes.

I saw that thread. It just wasn't very concise in my opinion and as far as using a temperature gun, those can be off if not used correctly. I'd sooner use a thermocouple.

One day, maybe this summer. Its more of a curiousity thing. Either way, the engine isn't going to blow up. My first project will be producing bearings for our dual distributors.

[efhughes3]

When someone like Steve Weiner says it is a non-needed accessory, I'll take that to the bank instead of other opinions one may see online. Some seem afraid to get out of bed in the morning.

[f3nr15]

Mine came off upon my purchase of the car 1 year ago, after spending the former 18 years of the car's life on, in the relatively warm Aussie climate. The engine, although low-miles, received a clean bill of health on compression testing at PPI, and still runs very well.

The undertray had more-or-less perished from having served its intended function as a drip-tray for hot oil , although the oils leaks had obviously been fixed previously because she continues to be drizabone.

I don't see the need for any fancy thermal testing - the tray either increases engine temps, or doesn't. Therefore, there's no harm in removing it. The only potential advantage to it would be an aero effect, which if present would prob be fairly minimal anyway, and certainly not relevant at the speeds that I drive.

(Although, I've got a spare tray stored away for concours...)

[bazar01]

No need for fancy tests. Just take that thing OFF.

[R K T]

Originally Posted by efhughes3

When someone like Steve Weiner says it is a non-needed accessory, I'll take that to the bank instead of other opinions one may see online. Some seem afraid to get out of bed in the morning.

Yes!

[Traveller]

Originally Posted by efhughes3

When someone like Steve Weiner says it is a non-needed accessory.

Then he can produce some actual measurement data and method of how that data was measured. I do in my lab at work. Most of us would be curious what the actual differences are.

[efhughes3]

It doesn't take a lab to deduce that not having the underside of an engine exposed would result in lower temps than if it is covered.

[R K T]

Originally Posted by efhughes3

It doesn't take a lab to deduce that not having the underside of an engine exposed would result in lower temps than if it is covered.

Yes again!!

[Traveller]

Originally Posted by efhughes3

It doesn't take a lab to deduce that not having the underside of an engine exposed would result in lower temps than if it is covered.

As long as you think so.

I don't know for sure, but that is why I''ll actually take measurements instead of commenting based on nothing.

[efhughes3]

Originally Posted by Traveller

As long as you think so.

I don't know for sure, but that is why I''ll actually take measurements instead of commenting based on nothing.

More compelling evidence in reverse: My feet were cold this morning after taking a shower-once I got my socks and shoes on, they got warmer. Hmmmm, I could be on to something here....